Adjustable chair back



sept.'3,19z9. E, c; HARfE'R `11,727,058

ADJUSTABLE CHAI-[R BACK Filed NOV. 21, 1927 Patented Sept. 3, 1929.

nire!) starts EVAN C. HARTER, OF STURGIS, MICHIGAN.

ADJUSTABLE kCHAIR BACK.

Applicationled November 21, 192'?. vf-erial No.v 234,639.

This invention relatesfto adjustable chairbacks and the like and is particularly adapted to be used on chairs where it is desirable to raise and lower the back; in order toI find a proper support for the individual using the chair.

An object ofthe invention is to provide a chair-back of this type which is very readily adjustable and which can be adjusted in a minimum of time and which requires for this purpose only the simplest of tools.

This and other objects, as will hereinafter appear, are accomplished by this invention which is fully described in the following specification and shown in the accompanying drawings, in which:

Figure 1 is a perspective view of a chair embodying the invention;

Fig. 2 is an enlarged partial sectional Viewv on the line 2 of Fig. 1; and

F ig. 3 is an enlarged section on the line 3 of Fig. 2.

The embodiment illustrated comprises a chair having a suitable base 10upon which is swivelly mounted a chair-bottom 11. This bottom is preferably made of sheet metal and has an upwardly turned edge 12, welded or otherwise secured thereto. Within this edge or rim which is preferably rectangular in form is fitted a removable seat-cushion A13 which may be padded or fitted with springs in any well known manner.

About the seat-cushion 13 and at the rear thereof is a back-rest 14 which is carried by supporting arms 15. These arms are preferably secured at their upper ends by means of pivots 16 to the lugs 17 on the back-rest while the lower forward end of each arm is threaded to receive a screw 18. This screw passes through a slot 19 in the vertical edge 12 of the bottom and may be tightened to secure the lower forward end of the arm 15 at any desired point along said slot. A brace 20 is pivotally connected at its upper end to the arm 15 by means of a pin 21 while the lower end of the brace is slot-ted to receive a nut 22 which is slidable therein. A screw 23 passes through a hole 24 in the rim 12 and is screwed into the nut 22 so as to secure the brace 2O to the rim 12 at any point along the slotted portion of the brace.'

In adjusting this back-rest, the operator removes the seat-cushion 13, loosens the screws 18 and 23 with a screwdriver and then proceeds to move the back-rest 14 up and down, forward and back until a position is found which seems best suited to the form of the person who is tooccupy the chair. During this operation and while these screws are still loosened, the seat-cushion 13 maybe replaced so that the person to use the chair may be seated while the back-rest is properly positioned.

As soon as this position isfound, the baclrrest is held in this adjusted position, the screws 18 and 23 at each side then being tightened while the seat-cushion 13 is removed.

Owing to the fact that these slots are continuous, the adjustment of the baclr, Vonce the screws 18 and 23 are loosened, can be made with greatest ease and expedition. This arrangement also is very neat since all the ad- `iusting screws are inside and are covered up by the seat-cushion.

While I have shown and described but a single embodiment of this invention, it is to be understood that it is capable of many modifications. Changes therefore in the construc,

tion and arrangement may be made which invention as disclosed in the appended claims.

I claim: l 1. In a chair, a chair-botto1n, a support therefor, a back-rest, a supporting arm at each side secured at one end to the baclorest and adjustably secured at the other to a side of said bottom, a brace at each side pivotally connected at its upper end to said arm, said brace having a slotted lower portion adapted to slidably hold a nut, a nut in sai-d slotted Aortion .and a screw eXtendin through an.

opening y in the side of said bottom and threaded into said nut to lock the nut in va-k v rious adjusted positions.

2. In a chair, a chair-bottom, a support therefor,a back-rest, a supporting arm at each side secured at one en-d to the-back-rest and adjustably secured at the other to a side of said bottom, a brace at each side pivotally connected at its upper end to said arm, said brace having a slotted lower portion adapted to slidably hold a nut, a nut in said slotted portion, and a screw extending through an opening in the side of said bottom and having a head on the inside of said bottom and threaded into said nut to lock the nut in various adj usted positions.

3. In a chair, a chair-bottom, a support therefor, a back-rest, asupporting arm at each side secured at the upper end to said back-rest, the lower end having a screwthreaded hole, seid bottoni having u rim with e slot at each side, a screw in said slot and screwed into said hole in the erin, e brace at each eide pivotally Connected at its upper end to seid erin, said brace having` e slotted lower portion adapted to slidably hold a nut, a nut in said slotted portion, and e Screw eX- tending through :in opening in the side oi' said bottom andvthreaded into seid nut to lock the nut in various adjusted positions.

4L. In a chair, a Chair-bottoni, a support therefor, a back-rest, e supporting arm et eeeh side secured et the upper end to seid back-rest, the lower enell having a screwthreeded hole, said bottom having a rim with a slot at each side, a screw in seid slot and screwed into said hole in the arm, a brace at each side pivotally Connected at its upper end to seid erin, Said brace having;` a slotted lower portion adapted to slidebly hold a nut, a nut in seid slotted portion, a, screw extending through en opening in the side of said bottom and threaded into said nut to look the nut in various adjusted positions, seid screws having their heads on the inside oif said bottom, und e removable seat-cushion Covering said screws.

In testimony whereof, I have hereunto set my hand this 2nd dey of November, 1927.

EVAN C. HARTER. 

